Dynamic Characteristics of Armature and Rail with Cambered Surface Under Moving Electromagnetic LoadChinese Full Text
YANG Lin;NIE Jianxin;REN Ming;ZHANG Leilei;JIN Zhaoxin;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology;Chongqing Hongyu Precision Industrial Co., Ltd;Xi’an Electronic Engineering Research Institute;
Abstract: In order to further improve the performance of rail electromagnetic launchers（railguns）, we studied the contact between rail and armature during launch processes by a finite element model of railgun established with LS-DYNA code. We designed three C-shaped armatures, which have concave surface trailing edges of different curvature radius, to match rails with curvatures, and calculated the dynamic mechanical response of these armature/rail pairs. The simulation results show that the contact force, for all the three armatures, quickly increases during 0~0.1 ms, fluctuates with relatively small amplitude during from 0.1 ms to approximately 0.74 ms, starts to fluctuate with larger amplitude at about 0.74 ms when the armature reaches its critical velocity, and eventually changes obviously and reaches a local minimum value at 0.755 ms. Meanwhile, the three armatures have pressure distribution similar to their contact surfaces. As for the rails in the three matches, their deflection curves are similar, and the contour maps of the rail deflection passed by armatures are hardly different. It is concluded that the sharp downward fluctuation of armature/rail contact force marks an armature reaching its critical velocity, and the distribution of contact pressure becomes unsteady afterwards. Additionally, different matches between rail and armature interface show little impact on the dynamic mechanical response of both armature and rail.
Keywords：
electromagnetic launcher; C-shaped armature; contact force; critical velocity; rail deflection; dynamic response;
- DOI：
10.13336/j.1003-6520.hve.2014.04.019
- Series：
- Subject：
- Classification Code：
TJ866
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